Critical error occured when trying to login in my thunkable app on other devices

[thinkable475gmyu]

hello,
i have crated an app which includes user registration and login pages and a small quiz of 10 questions ,called “Quiz”.
this app is working fine on thunkable website web preview, and also working fine on my mobile as i have downloaded thunkable app and run this quiz app through thunkable. but when i downloaded apk file and shared it to other device, after installing it worked for starting 2-3 screens ,but after taking user id and password when user hits login button it showed this screen

plz help as i am new to this thunkable platform.

[jared]

Please check this out. Perhaps some debugging would be helpful.

Debugging in Thunkable X (Video)

Does the app work when you preview in the app builder?

[verma.sunita008g2]